Ответ:

  1. \(1\frac{1}{2}\cdot2\frac{1}{3}=\frac{3}{2}\cdot\frac{7}{3}=\frac{7}{2}=3\frac{1}{2}\).
  2. \(2\frac{2}{5}\cdot1\frac{1}{4}=\frac{12}{5}\cdot\frac{5}{4}=3\).
  3. \(3\frac{1}{3}:1\frac{1}{2}=\frac{10}{3}:\frac{3}{2}=\frac{10}{3}\cdot\frac{2}{3}=\frac{20}{9}=2\frac{2}{9}\).
  4. \(2\frac{3}{4}:1\frac{2}{3}=\frac{11}{4}:\frac{5}{3}=\frac{11}{4}\cdot\frac{3}{5}=\frac{33}{20}=1\frac{13}{20}\).

Ответ: 1) \(3\frac{1}{2}\); 2) \(3\); 3) \(2\frac{2}{9}\); 4) \(1\frac{13}{20}\).